kafka KStreamImplJoin 源码
kafka KStreamImplJoin 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/KStreamImplJoin.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.streams.kstream.internals;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.kstream.JoinWindows;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.StreamJoined;
import org.apache.kafka.streams.kstream.ValueJoinerWithKey;
import org.apache.kafka.streams.kstream.internals.graph.GraphNode;
import org.apache.kafka.streams.kstream.internals.graph.ProcessorGraphNode;
import org.apache.kafka.streams.kstream.internals.graph.ProcessorParameters;
import org.apache.kafka.streams.kstream.internals.graph.StreamStreamJoinNode;
import org.apache.kafka.streams.kstream.internals.graph.WindowedStreamProcessorNode;
import org.apache.kafka.streams.state.KeyValueStore;
import org.apache.kafka.streams.state.internals.TimestampedKeyAndJoinSide;
import org.apache.kafka.streams.state.StoreBuilder;
import org.apache.kafka.streams.state.Stores;
import org.apache.kafka.streams.state.internals.LeftOrRightValue;
import org.apache.kafka.streams.state.WindowBytesStoreSupplier;
import org.apache.kafka.streams.state.WindowStore;
import org.apache.kafka.streams.state.internals.TimestampedKeyAndJoinSideSerde;
import org.apache.kafka.streams.state.internals.ListValueStoreBuilder;
import org.apache.kafka.streams.state.internals.LeftOrRightValueSerde;
import java.time.Duration;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import static org.apache.kafka.streams.internals.ApiUtils.prepareMillisCheckFailMsgPrefix;
import static org.apache.kafka.streams.internals.ApiUtils.validateMillisecondDuration;
class KStreamImplJoin {
private final InternalStreamsBuilder builder;
private final boolean leftOuter;
private final boolean rightOuter;
static class TimeTracker {
private long emitIntervalMs = 1000L;
long streamTime = ConsumerRecord.NO_TIMESTAMP;
long minTime = Long.MAX_VALUE;
long nextTimeToEmit;
public void setEmitInterval(final long emitIntervalMs) {
this.emitIntervalMs = emitIntervalMs;
}
public void advanceStreamTime(final long recordTimestamp) {
streamTime = Math.max(recordTimestamp, streamTime);
}
public void updatedMinTime(final long recordTimestamp) {
minTime = Math.min(recordTimestamp, minTime);
}
public void advanceNextTimeToEmit() {
nextTimeToEmit += emitIntervalMs;
}
}
KStreamImplJoin(final InternalStreamsBuilder builder,
final boolean leftOuter,
final boolean rightOuter) {
this.builder = builder;
this.leftOuter = leftOuter;
this.rightOuter = rightOuter;
}
public <K, V1, V2, VOut> KStream<K, VOut> join(final KStream<K, V1> lhs,
final KStream<K, V2> other,
final ValueJoinerWithKey<? super K, ? super V1, ? super V2, ? extends VOut> joiner,
final JoinWindows windows,
final StreamJoined<K, V1, V2> streamJoined) {
final StreamJoinedInternal<K, V1, V2> streamJoinedInternal = new StreamJoinedInternal<>(streamJoined);
final NamedInternal renamed = new NamedInternal(streamJoinedInternal.name());
final String joinThisSuffix = rightOuter ? "-outer-this-join" : "-this-join";
final String joinOtherSuffix = leftOuter ? "-outer-other-join" : "-other-join";
final String thisWindowStreamProcessorName = renamed.suffixWithOrElseGet(
"-this-windowed", builder, KStreamImpl.WINDOWED_NAME);
final String otherWindowStreamProcessorName = renamed.suffixWithOrElseGet(
"-other-windowed", builder, KStreamImpl.WINDOWED_NAME);
final String joinThisGeneratedName = rightOuter ? builder.newProcessorName(KStreamImpl.OUTERTHIS_NAME) : builder.newProcessorName(KStreamImpl.JOINTHIS_NAME);
final String joinOtherGeneratedName = leftOuter ? builder.newProcessorName(KStreamImpl.OUTEROTHER_NAME) : builder.newProcessorName(KStreamImpl.JOINOTHER_NAME);
final String joinThisName = renamed.suffixWithOrElseGet(joinThisSuffix, joinThisGeneratedName);
final String joinOtherName = renamed.suffixWithOrElseGet(joinOtherSuffix, joinOtherGeneratedName);
final String joinMergeName = renamed.suffixWithOrElseGet(
"-merge", builder, KStreamImpl.MERGE_NAME);
final GraphNode thisGraphNode = ((AbstractStream<?, ?>) lhs).graphNode;
final GraphNode otherGraphNode = ((AbstractStream<?, ?>) other).graphNode;
final StoreBuilder<WindowStore<K, V1>> thisWindowStore;
final StoreBuilder<WindowStore<K, V2>> otherWindowStore;
final String userProvidedBaseStoreName = streamJoinedInternal.storeName();
final WindowBytesStoreSupplier thisStoreSupplier = streamJoinedInternal.thisStoreSupplier();
final WindowBytesStoreSupplier otherStoreSupplier = streamJoinedInternal.otherStoreSupplier();
assertUniqueStoreNames(thisStoreSupplier, otherStoreSupplier);
if (thisStoreSupplier == null) {
final String thisJoinStoreName = userProvidedBaseStoreName == null ? joinThisGeneratedName : userProvidedBaseStoreName + joinThisSuffix;
thisWindowStore = joinWindowStoreBuilder(thisJoinStoreName, windows, streamJoinedInternal.keySerde(), streamJoinedInternal.valueSerde(), streamJoinedInternal.loggingEnabled(), streamJoinedInternal.logConfig());
} else {
assertWindowSettings(thisStoreSupplier, windows);
thisWindowStore = joinWindowStoreBuilderFromSupplier(thisStoreSupplier, streamJoinedInternal.keySerde(), streamJoinedInternal.valueSerde());
}
if (otherStoreSupplier == null) {
final String otherJoinStoreName = userProvidedBaseStoreName == null ? joinOtherGeneratedName : userProvidedBaseStoreName + joinOtherSuffix;
otherWindowStore = joinWindowStoreBuilder(otherJoinStoreName, windows, streamJoinedInternal.keySerde(), streamJoinedInternal.otherValueSerde(), streamJoinedInternal.loggingEnabled(), streamJoinedInternal.logConfig());
} else {
assertWindowSettings(otherStoreSupplier, windows);
otherWindowStore = joinWindowStoreBuilderFromSupplier(otherStoreSupplier, streamJoinedInternal.keySerde(), streamJoinedInternal.otherValueSerde());
}
final KStreamJoinWindow<K, V1> thisWindowedStream = new KStreamJoinWindow<>(thisWindowStore.name());
final ProcessorParameters<K, V1, ?, ?> thisWindowStreamProcessorParams = new ProcessorParameters<>(thisWindowedStream, thisWindowStreamProcessorName);
final ProcessorGraphNode<K, V1> thisWindowedStreamsNode = new WindowedStreamProcessorNode<>(thisWindowStore.name(), thisWindowStreamProcessorParams);
builder.addGraphNode(thisGraphNode, thisWindowedStreamsNode);
final KStreamJoinWindow<K, V2> otherWindowedStream = new KStreamJoinWindow<>(otherWindowStore.name());
final ProcessorParameters<K, V2, ?, ?> otherWindowStreamProcessorParams = new ProcessorParameters<>(otherWindowedStream, otherWindowStreamProcessorName);
final ProcessorGraphNode<K, V2> otherWindowedStreamsNode = new WindowedStreamProcessorNode<>(otherWindowStore.name(), otherWindowStreamProcessorParams);
builder.addGraphNode(otherGraphNode, otherWindowedStreamsNode);
Optional<StoreBuilder<KeyValueStore<TimestampedKeyAndJoinSide<K>, LeftOrRightValue<V1, V2>>>> outerJoinWindowStore = Optional.empty();
if (leftOuter) {
outerJoinWindowStore = Optional.of(sharedOuterJoinWindowStoreBuilder(windows, streamJoinedInternal, joinThisGeneratedName));
}
// Time-shared between joins to keep track of the maximum stream time
final TimeTracker sharedTimeTracker = new TimeTracker();
final JoinWindowsInternal internalWindows = new JoinWindowsInternal(windows);
final KStreamKStreamJoin<K, V1, V2, VOut> joinThis = new KStreamKStreamJoin<>(
true,
otherWindowStore.name(),
internalWindows,
joiner,
leftOuter,
outerJoinWindowStore.map(StoreBuilder::name),
sharedTimeTracker
);
final KStreamKStreamJoin<K, V2, V1, VOut> joinOther = new KStreamKStreamJoin<>(
false,
thisWindowStore.name(),
internalWindows,
AbstractStream.reverseJoinerWithKey(joiner),
rightOuter,
outerJoinWindowStore.map(StoreBuilder::name),
sharedTimeTracker
);
final KStreamKStreamSelfJoin<K, V1, V2, VOut> selfJoin = new KStreamKStreamSelfJoin<>(
thisWindowStore.name(),
internalWindows,
joiner,
sharedTimeTracker
);
final PassThrough<K, VOut> joinMerge = new PassThrough<>();
final StreamStreamJoinNode.StreamStreamJoinNodeBuilder<K, V1, V2, VOut> joinBuilder = StreamStreamJoinNode.streamStreamJoinNodeBuilder();
final ProcessorParameters<K, V1, ?, ?> joinThisProcessorParams = new ProcessorParameters<>(joinThis, joinThisName);
final ProcessorParameters<K, V2, ?, ?> joinOtherProcessorParams = new ProcessorParameters<>(joinOther, joinOtherName);
final ProcessorParameters<K, VOut, ?, ?> joinMergeProcessorParams = new ProcessorParameters<>(joinMerge, joinMergeName);
final ProcessorParameters<K, V1, ?, ?> selfJoinProcessorParams = new ProcessorParameters<>(selfJoin, joinMergeName);
joinBuilder.withJoinMergeProcessorParameters(joinMergeProcessorParams)
.withJoinThisProcessorParameters(joinThisProcessorParams)
.withJoinOtherProcessorParameters(joinOtherProcessorParams)
.withThisWindowStoreBuilder(thisWindowStore)
.withOtherWindowStoreBuilder(otherWindowStore)
.withThisWindowedStreamProcessorParameters(thisWindowStreamProcessorParams)
.withOtherWindowedStreamProcessorParameters(otherWindowStreamProcessorParams)
.withOuterJoinWindowStoreBuilder(outerJoinWindowStore)
.withValueJoiner(joiner)
.withNodeName(joinMergeName)
.withSelfJoinProcessorParameters(selfJoinProcessorParams);
if (internalWindows.spuriousResultFixEnabled()) {
joinBuilder.withSpuriousResultFixEnabled();
}
final GraphNode joinGraphNode = joinBuilder.build();
builder.addGraphNode(Arrays.asList(thisGraphNode, otherGraphNode), joinGraphNode);
final Set<String> allSourceNodes = new HashSet<>(((KStreamImpl<K, V1>) lhs).subTopologySourceNodes);
allSourceNodes.addAll(((KStreamImpl<K, V2>) other).subTopologySourceNodes);
// do not have serde for joined result;
// also for key serde we do not inherit from either since we cannot tell if these two serdes are different
return new KStreamImpl<>(joinMergeName, streamJoinedInternal.keySerde(), null, allSourceNodes, false, joinGraphNode, builder);
}
private void assertWindowSettings(final WindowBytesStoreSupplier supplier, final JoinWindows joinWindows) {
if (!supplier.retainDuplicates()) {
throw new StreamsException("The StoreSupplier must set retainDuplicates=true, found retainDuplicates=false");
}
final boolean allMatch = supplier.retentionPeriod() == (joinWindows.size() + joinWindows.gracePeriodMs()) &&
supplier.windowSize() == joinWindows.size();
if (!allMatch) {
throw new StreamsException(String.format("Window settings mismatch. WindowBytesStoreSupplier settings %s must match JoinWindows settings %s" +
" for the window size and retention period", supplier, joinWindows));
}
}
private void assertUniqueStoreNames(final WindowBytesStoreSupplier supplier,
final WindowBytesStoreSupplier otherSupplier) {
if (supplier != null
&& otherSupplier != null
&& supplier.name().equals(otherSupplier.name())) {
throw new StreamsException("Both StoreSuppliers have the same name. StoreSuppliers must provide unique names");
}
}
private static <K, V> StoreBuilder<WindowStore<K, V>> joinWindowStoreBuilder(final String storeName,
final JoinWindows windows,
final Serde<K> keySerde,
final Serde<V> valueSerde,
final boolean loggingEnabled,
final Map<String, String> logConfig) {
final StoreBuilder<WindowStore<K, V>> builder = Stores.windowStoreBuilder(
Stores.persistentWindowStore(
storeName + "-store",
Duration.ofMillis(windows.size() + windows.gracePeriodMs()),
Duration.ofMillis(windows.size()),
true
),
keySerde,
valueSerde
);
if (loggingEnabled) {
builder.withLoggingEnabled(logConfig);
} else {
builder.withLoggingDisabled();
}
return builder;
}
private <K, V1, V2> String buildOuterJoinWindowStoreName(final StreamJoinedInternal<K, V1, V2> streamJoinedInternal, final String joinThisGeneratedName) {
final String outerJoinSuffix = rightOuter ? "-outer-shared-join" : "-left-shared-join";
if (streamJoinedInternal.thisStoreSupplier() != null && !streamJoinedInternal.thisStoreSupplier().name().isEmpty()) {
return streamJoinedInternal.thisStoreSupplier().name() + outerJoinSuffix;
} else if (streamJoinedInternal.storeName() != null) {
return streamJoinedInternal.storeName() + outerJoinSuffix;
} else {
return KStreamImpl.OUTERSHARED_NAME
+ joinThisGeneratedName.substring(
rightOuter
? KStreamImpl.OUTERTHIS_NAME.length()
: KStreamImpl.JOINTHIS_NAME.length());
}
}
private <K, V1, V2> StoreBuilder<KeyValueStore<TimestampedKeyAndJoinSide<K>, LeftOrRightValue<V1, V2>>> sharedOuterJoinWindowStoreBuilder(final JoinWindows windows,
final StreamJoinedInternal<K, V1, V2> streamJoinedInternal,
final String joinThisGeneratedName) {
final boolean persistent = streamJoinedInternal.thisStoreSupplier() == null || streamJoinedInternal.thisStoreSupplier().get().persistent();
final String storeName = buildOuterJoinWindowStoreName(streamJoinedInternal, joinThisGeneratedName) + "-store";
// we are using a key-value store with list-values for the shared store, and have the window retention / grace period
// handled totally on the processor node level, and hence here we are only validating these values but not using them at all
final Duration retentionPeriod = Duration.ofMillis(windows.size() + windows.gracePeriodMs());
final Duration windowSize = Duration.ofMillis(windows.size());
final String rpMsgPrefix = prepareMillisCheckFailMsgPrefix(retentionPeriod, "retentionPeriod");
final long retentionMs = validateMillisecondDuration(retentionPeriod, rpMsgPrefix);
final String wsMsgPrefix = prepareMillisCheckFailMsgPrefix(windowSize, "windowSize");
final long windowSizeMs = validateMillisecondDuration(windowSize, wsMsgPrefix);
if (retentionMs < 0L) {
throw new IllegalArgumentException("retentionPeriod cannot be negative");
}
if (windowSizeMs < 0L) {
throw new IllegalArgumentException("windowSize cannot be negative");
}
if (windowSizeMs > retentionMs) {
throw new IllegalArgumentException("The retention period of the window store "
+ storeName + " must be no smaller than its window size. Got size=["
+ windowSizeMs + "], retention=[" + retentionMs + "]");
}
final TimestampedKeyAndJoinSideSerde<K> timestampedKeyAndJoinSideSerde = new TimestampedKeyAndJoinSideSerde<>(streamJoinedInternal.keySerde());
final LeftOrRightValueSerde<V1, V2> leftOrRightValueSerde = new LeftOrRightValueSerde<>(streamJoinedInternal.valueSerde(), streamJoinedInternal.otherValueSerde());
final StoreBuilder<KeyValueStore<TimestampedKeyAndJoinSide<K>, LeftOrRightValue<V1, V2>>> builder =
new ListValueStoreBuilder<>(
persistent ? Stores.persistentKeyValueStore(storeName) : Stores.inMemoryKeyValueStore(storeName),
timestampedKeyAndJoinSideSerde,
leftOrRightValueSerde,
Time.SYSTEM
);
if (streamJoinedInternal.loggingEnabled()) {
builder.withLoggingEnabled(streamJoinedInternal.logConfig());
} else {
builder.withLoggingDisabled();
}
return builder;
}
private static <K, V> StoreBuilder<WindowStore<K, V>> joinWindowStoreBuilderFromSupplier(final WindowBytesStoreSupplier storeSupplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
return Stores.windowStoreBuilder(
storeSupplier,
keySerde,
valueSerde
);
}
}
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